Microwave Characteristics of (Pb,Ca)(Fe,Nb,Sn)O3 Dielectric Materials |
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Authors: | Sergey Kucheiko Ji-Won Choi Hyun-Jai Kim Seok-Jin Yoon Hyung-Jin Jung |
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Affiliation: | Division of Ceramics, Korea Institute of Science and Technology, Seoul 130-650, Korea |
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Abstract: | The dielectric properties of (Pb1? x Ca x ){(Fe1/2Nb1/2)1– y Sn y }O3 solid solutions, where 0.4 lessthan equal tox ≤ 0.6, y = 0.05, 0.1, have been investigated at microwave frequencies. The replacement of Fe3+/Nb5+ by Sn4+ at the B–site of the perov-skite structure considerably improves the loss quality factor Q and does not remarkably affect the dielectric constant epsilonr and the temperature coefficient of resonant frequency tauf. The tauf value of nearly 0 ppm/°C can be realized for x= 0.55. New high-quality dielectric ceramics having epsilonr of 85.3-89.9,Qf values of 7510-8600 GHz, and τf of 0-9 ppm/°C were obtained at 1150°C for 3 h sintering in air. The influence of the sintering atmosphere on dielectric properties was also investigated. |
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